Mecca vs Rancho Murieta: PM2.5 compared

Over the last year, Mecca's air was about 2.5× as polluted as Rancho Murieta's: PM2.5 averaged 12.2 µg/m³ against 4.9, on the 78 days both cities were measured. Mecca had the dirtier air on 62 of those days, Rancho Murieta on 16. Mecca was over the WHO's daily guideline of 15 µg/m³ on 24 of them, Rancho Murieta on 0.

Right now

Mecca#87on the 24-hour board of 2,002, at 77 US AQI (23.1 µg/m³)

Rancho Murieta#940on the 24-hour board of 2,002, at 38 US AQI (6.9 µg/m³)

The last year, day by day

Mecca

Rancho Murieta

Each city's daily mean from 7 Oct 2025 to 6 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

Monthly means in µg/m³ over the days both cities were measured. Solid: Mecca. Faded: Rancho Murieta. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Each city's worst days

Mecca

21 May 202614854.6 µg/m³
16 May 202613047.2 µg/m³
18 May 20269733.8 µg/m³

Rancho Murieta

1 May 20265310.4 µg/m³
2 Oct 2026529.4 µg/m³
9 May 2026509.0 µg/m³

Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.

Compare either city with another

Mecca

Side by side with Indio (the nearest), Hanford (United States's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).

Rancho Murieta

Side by side with Folsom (the nearest), Gujranwala (the world's worst on 30 days).

Use this page

SmogRank, PM2.5 daily means compared, Mecca and Rancho Murieta, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/us-mecca/us-rancho-murieta (accessed 7 Oct 2026).

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.

Updated 2026-10-07 08:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.